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12 Oct 2023

Custom ordering-sorting in pandas

To sort string values in a dataframe in a specific (non-alph.) order, one option is to use categorical variables1:

COLLECTIONS_ORDER = [
    "Final terms",
    "Base prospects",
    "Annual reports",
    "IFRS",
    "Law",
    "Brochures & Handouts",
    "BBK monthly reports",
]

df[KCOL] = pd.Categorical(df[KCOL], categories=COLLECTIONS_ORDER, ordered=True)

df.sort_values(KCOL, ascending=True)

Neat when doing graphs or summary/aggregated tables!

  1. From python - Sort column in Pandas DataFrame by specific order - Stack Overflow ↩︎

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Nel mezzo del deserto posso dire tutto quello che voglio.